Fair Value Measurements - Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Rolling production average	60 days
Impairment of proved oil and gas properties		$ 17,400
Impairment of goodwill		674
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion expense	$ 0	36
Contingent consideration payable | Recurring | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	0	1,852
Accretion expense	0	36
Revision to estimate	0	(1,888)
Fiscal year closing balance	$ 0	$ 0